Cisco Systems OL-4580-01 Configuring Box-to-Box Redundancy, Configuring IP Equal-Cost Multipath

Chapter 6 Configuring the Internet Protocol

Configuring Box-to-Box Redundancy

The CSS does not load balance TCP or UDP packets with IP options that are destined to a VIP address. These packet types are dropped and the CSS returns an ICMP destination/port unreachable error. This behavior exists regardless of the state (enabled or disabled) of the ip record-routeand ip source-routecommands.

The CSS, however, does respond to ICMP packets that are destined to a VIP address. The CSS also responds to TCP or UDP packets that include IP options that are destined to a local circuit address, or require that a routing decision be made.

To disable the processing of frames with the record-route option (the default behavior), enter:

(config)# no ip record-route

Configuring Box-to-Box Redundancy

Box-to-box redundancy provides chassis-level redundancy between two identically configured CSSs. Refer to the Cisco Content Services Switch Redundancy Guide for information about configuring box-to-box redundancy. Use the ip redundancy command to enable box-to-box redundancy.

The CSS does not support simultaneous box-to-box redundancy and VIP or interface redundancy configurations.

For example:

(config)# ip redundancy

To disable box-to-box redundancy, enter:

(config)# no ip redundancy

Configuring IP Equal-Cost Multipath

	To set the equal-cost multipath (ECMP) selection algorithm and the preferred
	reverse egress path, use the ip ecmp command. The CSS supports a maximum of
	15 ECMP paths.
	The syntax for this global configuration command is:
	ip ecmp [addressno-prefer-ingressroundrobin]
	Cisco Content Services Switch Routing and Bridging Configuration Guide
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